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Finding the Fourth Proportional to 231.53, 347.22 and 87.21

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Solution

The fourth proportional to 231.53, 347.22 and 87.21 is: 130.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.53 : 347.22 = 87.21 : x
  2. Step 2: Convert to fraction form
    231.53/347.22 = 87.21/x
  3. Step 3: Cross multiply
    231.53x = 347.22 × 87.21
  4. Step 4: Simplify right side
    231.53x = 30,281.06
  5. Step 5: Solve for x
    x = 30,281.06/231.53
  6. Step 6: Final answer
    x = 130.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.